I started building a stadium, because I was getting low on amenities. I chose the city where the stadium would have the most impact (4 cities within 6 tiles), rather than the city with the highest production, so the construction has been going on for a while. It's 72% complete and I need 7 more turns to finish it.
I now have the gold to buy the stadium and I could really use the extra amenities, but I'm worried that I will just lose all the production I've spent on it so far. I've already checked that the price to buy the building isn't reduced by the production already spent, so unless the production is kept for whatever the city produces next, it will be lost.
Did anyone try this and knows what happens?